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Redox active reversible electrode and novel battery using the same

a reversible electrode and redox technology, applied in cell components, electrochemical generators, transportation and packaging, etc., can solve the problems of slow electron transfer reaction, faradaic current response based on redox reaction cannot be obtained at a certain constant potential, and film made of this material has no electron conductivity, etc., to achieve high energy density, high electron conductivity, and high electron transfer promotion

Inactive Publication Date: 2005-01-13
NOBORU OYAMA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] In order to use a sulfur compound (sulfide compound) as an active material for a positive electrode of a lithium secondary battery, it is necessary that an electrically conductive polymer of a π conjugated compound, which has an oxidation-reduction reactivity so as to pass a current with a high energy d

Problems solved by technology

However, these materials entail such a drawback that a definite faradaic current response based on the redox reaction cannot be obtained at a certain constant potential.
On the other hand, a sulfur compound has an oxidation-reduction reactivity, exhibits a large faradaic current response and has a capability of accumulating energy at a high density; however its electron transfer reaction is slow and a thin film made of this material has no electron conductivity.

Method used

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  • Redox active reversible electrode and novel battery using the same
  • Redox active reversible electrode and novel battery using the same
  • Redox active reversible electrode and novel battery using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0063] An acetonitrile (AN) solution (solution for electrolytic polymerization) containing 20 mM of EDOT monomer among the thiophene compounds represented by the formula (II) and 0.1M of lithium perchlorate (LiClO4) as a supporting electrolyte was prepared.

[0064] A PEDOT coated electrode was prepared in the following manner. Using a 3-electrode type cell, with a glassy carbon disk electrode having a diameter of 3 mm used as a working electrode, a coil platinum wire used as a counter electrode and a silver ion electrode used as a reference electrode, an electrolytic oxidative polymerization was carried out in the solution for electrolytic polymerization described above, thereby preparing a PEDOT coated electrode. The silver ion electrode was prepared by dissolving 0.5M silver perchlorate into the solvent (AN) used, and employing a commercially available holder with the solvent used as an inner solution. The glassy carbon disk electrode was used after polishing it with polishing alum...

example 2

[0066] As a typical example of the organic sulfur compound, 2,5-dimercapto-1,3,4-thiadiazole (DMcT) was selected. 1.0M LiBF4 was dissolved into an AN solution of 1.0M LiClO4, an N-methyl-2-pyrrolidinone (NMP) solution of 1.0M LiClO4, and a solution obtained by mixing propylenecarbonate (PC) and ethylenecarbonate (EC) at a weight ratio of 1:1, each containing 5 mM of DMcT, to prepare an electrolytic solution. Subsequently, the glassy carbon electrode as the working electrode coated with the PEDOT film was prepared by the same method as the method of Example 1, using the electrolytic solutions prepared above. Then, the CV measurement was carried out.

[0067]FIGS. 4A and 4B are CVs of DMcT, which were measured using a PEDOT uncoated electrode and the PEDOT coated electrode, respectively, in the AN electrolyte solution. The measurements were carried out while changing the potential sweeping range. The CVs obtained by performing potential sweeping in a range of from −0.6V to +0.8V are sho...

example 3

[0070] A solution used for measurement was prepared by adding DMcT to an NMP containing 0.1M LiClO4 to make 2 mM DMcT solution. As the working electrode, a glassy carbon disk electrode (having a diameter of 3 mm) for the hydrodynamic voltammetry was used. In the same manner as that of Example 2, a PEDOT coated electrode was prepared. Using a coil platinum wire as the counter electrode and a silver ion electrode as the reference electrode, the measurements were carried out. FIG. 5 shows current-potential curves for the oxidation reaction of from a monomer to a dimmer of DMct obtained from a rotation speed of 400 rpm (number of rotation / min) at the PEDOT thin film and the uncoated electrode. The graph (a) in FIG. 5 is a current-potential curve obtained with use of the uncoated electrode. An increase in limiting current was observed as the rotation speed increased. Further, as the rotation speed increased, the half wave potential was shifted to the positive electrode side. The graph (b...

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Abstract

A redox active reversible electrode includes a conductive substrate and a redox active film formed on at least one surface of the conductive substrate. The redox active film contains a redox active sulfur compound and an electrically conductive polymer of a π electron conjugated compound having p-type doping characteristics.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a Continuation Application of PCT Application No. PCT / JP02 / 08122, filed Aug. 8, 2002, which was published under PCT Article 21 (2) in Japanese. [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2002-031472, filed Feb. 7, 2002, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION [0003] 1. Field of the Invention [0004] The present invention relates to a redox active (oxidation-reduction active) reversible electrode employed in an electrochemical device such as a battery or a capacitor, and more specifically to a redox active electrode having a redox active film capable of a rapid electron and charge transfer reaction, formed on an electrically conductive substrate. Further, the present invention relates to a lithium secondary battery, a pseudo capacitor and a pseudo secondary battery (to be called as redox secondary battery ...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/22H01G11/02H01G11/42H01G11/48H01M4/137H01M4/58H01M4/60H01M10/052H01M10/36
CPCH01G9/155H01G9/22H01G11/02H01G11/42H01G11/48H01M4/137Y02T10/7022H01M4/60H01M4/606H01M10/052Y02E60/122Y02E60/13Y02T10/7011H01M4/5815Y02T10/70Y02E60/10H01G9/042
Inventor OYAMAMATSUKAWA, MIYUKISHIMOMURA, TAKESHIYAMAGUCHI, SHUICHIRO
Owner NOBORU OYAMA
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